The "Snoopy Cap" (or CCA—the little hat that holds the communications headset onto the astronauts’ heads) is nicknamed that because its two-tone design (white in the middle, black on the sides) resembles Snoopy’s head. But why the two-tone design? Why not all white or all black?
It looks like the earliest designs used two fabrics(lycra for the middle, teflon for the sides). But fabric technology has come a long way, and lycra is available in every color of the rainbow now (even if it wasn’t back then—not sure of lycra’s tiemline). Per this NASA page, it looks like it’s still that two-tone design.
So why the continued two-tone design?